<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="110px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>

            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品分类" prop="goods_cat">
              <el-alert title="注意: 只能选择第三极分类!" type="warning" :closable="false" show-icon> </el-alert>
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{
                  expandTrigger: 'hover',
                  label: 'cat_name',
                  value: 'cat_id',
                  children: 'children'
                }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的 item 项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片上传到的后台 Api 接口地址 -->
            <el-upload
              :headers="headerObj"
              :action="uploadURL"
              :on-success="handleSuccess"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>

          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"> 添加商品 </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
import { getCate, getCateById, postAddGoods } from '@/api/goods'

export default {
  name: 'add',
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属分类数组
        goods_cat: [],
        // 图片数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单数据验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      // 商品分类列表
      cateList: [],
      // 商品参数列表数据
      manyTabData: [],
      // 商品属性列表数据
      onlyTabData: [],
      // 上传图片的 URL 地址
      uploadURL: 'http://localhost:8888/api/v1/upload',
      // 图片上传的请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const res = await getCate()
      if (res.meta.status === 200) {
        this.cateList = res.data
      } else {
        this.$message.error('获取商品分类数据请求失败')
      }
    },

    // 级联选择器选中项变化时触发
    handleChange(e) {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },

    // 标签页跳转判断
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择分类')
        return false
      }
    },

    // 标签跳转
    async tabClicked() {
      // 访问的是商品参数面板
      if (this.activeIndex === '1') {
        let params = {
          id: this.cateId,
          sel: 'many'
        }
        const res = await getCateById(params)
        if (res.meta.status === 200) {
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === '0' ? [] : item.attr_vals.split(' ')
          })
          this.manyTabData = res.data
        } else {
          this.$message.error(res.meta.msg)
        }
      } else if (this.activeIndex === '2') {
        let params = {
          id: this.cateId,
          sel: 'only'
        }
        const res = await getCateById(params)
        if (res.meta.status === 200) {
          this.onlyTabData = res.data
        } else {
          this.$message.error('获取商品属性失败')
        }
      }
    },

    // 处理图片预览事件
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },

    // 处理图片删除事件
    handleRemove(file) {
      // 01.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 02.从 pics 数组中找到这个图片的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 03.调用数组的 splice 方法，把图片信息从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
    },

    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 01.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 02.讲图片信息对象 push 到 data.pics。 数组中
      this.addForm.pics.push(picInfo)
    },

    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (valid) {
          // 执行添加的逻辑
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理商品参数
          this.manyTabData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理商品属性
          this.onlyTabData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          // 发起请求添加商品
          // 商品名称必须是唯一的
          const res = await postAddGoods(form)
          if (res.meta.status === 201) {
            this.$message.success('添加商品成功')
            this.$router.push('/goods')
          } else {
            this.$message.error(res.meta.msg)
          }
        } else {
          this.$message.error('请填写必要的表单项')
        }
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.el-upload__tip {
  margin-top: 8px;
  font-size: 14px;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
